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Spending more time in the dark could boost hearing in old age

Your brain can do amazing things, not least of which is change. Specifically, neurons can adapt and grow new connections to help compensate for a loss in function in other areas. This has been most dramatically shown in children who have an entire hemisphere of their brain removed, usually to treat extreme cases of epilepsy, the other side taking over so that they can still walk, talk and function normally. Another common example of this type of neural plasticity is the improvement of other senses, particularly hearing, after the loss of sight.

In my latest article for The Guardian, I review a study that reports improvements in hearing in mice that have been visually sensory deprived for a week — meaning they were locked in a darkened room. Amazingly, cells in a sensory relay-station part of the brain reorganized to strengthen their hearing after this temporary loss of sight, even in older mice, which were previously thought to be exempt from this ability. While it’s still early days, this finding opens up the possibility for less invasive ways to treat hearing loss in old age.